165305011920 has 80 divisors (see below), whose sum is σ = 516357433152. Its totient is φ = 43744829440.

The previous prime is 165305011901. The next prime is 165305011933. The reversal of 165305011920 is 29110503561.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2597457 + ... + 2660336.

Almost surely, 2^165305011920 is an apocalyptic number.

165305011920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165305011920 is an abundant number, since it is smaller than the sum of its proper divisors (351052421232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165305011920 is a wasteful number, since it uses less digits than its factorization.

165305011920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257940 (or 5257934 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 33.

The spelling of 165305011920 in words is "one hundred sixty-five billion, three hundred five million, eleven thousand, nine hundred twenty".